PP Brembo front rotor weight, lighter-weight alternatives? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ZDan · 05-18-2020, 11:53 AM

Anybody know how much the factory BRZ PP Brembo front rotors weigh?
Apparently DBA 2-piece rotors weigh 21 lb., would like to know how much lighter than stock that is.
Any other lighter-weight rotor options for Performance Package Brembos?

Racecomp Engineering · 05-18-2020, 12:14 PM

Approx 23 lbs for OEM

PFC has 2 piece rotors...17.7 lbs. Price is around $1k-ish (need to double check). We used to run these a lot on our older STI track cars.

These are the larger 2018+ 6 piston STI brembo rotors pictured below...same idea.

- Andrew

NaturallyAspirated · 05-18-2020, 12:27 PM

I looked into this a while back while searching for BBKs for my old GC.

Take a look at the Girodisc 2-piece rotors. They're about $800 per pair. Lots of positive feedback from the STi owners over at IWSTi.

Weight measurement compared to stock rotors shown below (and link to thread). Keep in mind our PP rear rotors have different hats so the weight might be slightly off. But the fronts are the same as the 4-pot STi I believe:

https://www.iwsti.com/threads/2018-s...8/post-4447496

Mike_ZN6 · 05-18-2020, 12:32 PM

I think the Girodisc 2-piece STi rotors will fit both front and rear for the Performance Package Brembos.

https://www.girodisc.com/Girodisc-Fr...i-_p_6545.html

https://www.girodisc.com/Girodisc-Re...Ti_p_5537.html

I think they are about 7 lbs lighter per side for the front and 3 lbs lighter per side for the rear.

Racecomp Engineering · 05-18-2020, 12:40 PM

08+ STI rears will only fit if the hat is dual drilled for 5x100 and 5x114.

- Andrew

Mike_ZN6 · 05-18-2020, 02:36 PM

Quote:

Originally Posted by Racecomp Engineering

08+ STI rears will only fit if the hat is dual drilled for 5x100 and 5x114.

- Andrew

I am not familiar with the STi hub and rotor specs over the generations. Girodisc also has a rear rotor for the 04-07 STi. Maybe this one will fit the PP rears?

https://www.girodisc.com/Girodisc-Re...Ti_p_5527.html

Racecomp Engineering · 05-18-2020, 02:44 PM

The trick is you need a "later" rear brembo but the later rear brembos for STI are all 5x114, although some aftermarket options are dual drilled with 5x114 and 5x100.

BRZ specific rear brembo rotors in 5x100 are harder to find but they do exist. I'm just not aware of any 2 piece options.

- Andrew

churchx · 05-18-2020, 04:03 PM

So someone should buy batch of those later STI ones from whomever, custom drill 5x100 in own shop (or offer such service) and then sell at slight premium

Racecomp Engineering · 05-18-2020, 04:05 PM

I mean Girodisc might even do it for you! We like the PFC front rotors but I have not tried Girodisc.

- Andrew

ZDan · 05-18-2020, 04:40 PM

Thanks so much guys!

If the Gerodisc for '04-'17 fronts fit I might just get 'em. -11.6 lb. unsprung mass off the nose of the car, for *only* $800! Dayum...

Probably stick with 1-piece rears for now...

ZDan · 05-19-2020, 06:32 PM

GiroDisc site doesn't show BRZ fitments, but this site shows front and rear Girodisc 2-piece rotors for BRZ "with Brembo brakes":
https://www.knsbrakes.com/c/car-item...5_Brake+Rotors

NaturallyAspirated · 05-19-2020, 06:51 PM

KNS Brakes is legit and I'd contact them to get more details.

I'm willing to bet the front rotors will be a direct fit, but as mentioned the rear hats will be different.

Racecomp Engineering · 05-19-2020, 09:20 PM

KNS Brakes are good peoples.

- Andrew

ZDan · 05-19-2020, 09:35 PM

Aright I'ma give the a call or drop em a line tomorry...

05-18-2020, 11:53 AM	#1
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	PP Brembo front rotor weight, lighter-weight alternatives? Anybody know how much the factory BRZ PP Brembo front rotors weigh? Apparently DBA 2-piece rotors weigh 21 lb., would like to know how much lighter than stock that is. Any other lighter-weight rotor options for Performance Package Brembos?

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05-18-2020, 12:14 PM	#2
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,406 Thanks: 3,419 Thanked 7,241 Times in 2,962 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	Approx 23 lbs for OEM PFC has 2 piece rotors...17.7 lbs. Price is around $1k-ish (need to double check). We used to run these a lot on our older STI track cars. These are the larger 2018+ 6 piston STI brembo rotors pictured below...same idea. - Andrew

05-18-2020, 12:27 PM	#3
NaturallyAspirated Member Join Date: Sep 2019 Drives: 2019 BRZ w/ PP Location: NorCal Posts: 77 Thanks: 96 Thanked 76 Times in 42 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I looked into this a while back while searching for BBKs for my old GC. Take a look at the Girodisc 2-piece rotors. They're about $800 per pair. Lots of positive feedback from the STi owners over at IWSTi. Weight measurement compared to stock rotors shown below (and link to thread). Keep in mind our PP rear rotors have different hats so the weight might be slightly off. But the fronts are the same as the 4-pot STi I believe: https://www.iwsti.com/threads/2018-s...8/post-4447496

05-18-2020, 12:32 PM	#4
Mike_ZN6 Senior Member Join Date: Apr 2020 Drives: 2016 Toyota 86 Location: DMV Posts: 426 Thanks: 253 Thanked 209 Times in 139 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I think the Girodisc 2-piece STi rotors will fit both front and rear for the Performance Package Brembos. https://www.girodisc.com/Girodisc-Fr...i-_p_6545.html https://www.girodisc.com/Girodisc-Re...Ti_p_5537.html I think they are about 7 lbs lighter per side for the front and 3 lbs lighter per side for the rear.

05-18-2020, 12:40 PM	#5
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,406 Thanks: 3,419 Thanked 7,241 Times in 2,962 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	08+ STI rears will only fit if the hat is dual drilled for 5x100 and 5x114. - Andrew

05-18-2020, 02:44 PM	#7
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,406 Thanks: 3,419 Thanked 7,241 Times in 2,962 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	The trick is you need a "later" rear brembo but the later rear brembos for STI are all 5x114, although some aftermarket options are dual drilled with 5x114 and 5x100. BRZ specific rear brembo rotors in 5x100 are harder to find but they do exist. I'm just not aware of any 2 piece options. - Andrew

05-18-2020, 04:03 PM	#8
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	So someone should buy batch of those later STI ones from whomever, custom drill 5x100 in own shop (or offer such service) and then sell at slight premium

05-18-2020, 04:05 PM	#9
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,406 Thanks: 3,419 Thanked 7,241 Times in 2,962 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	I mean Girodisc might even do it for you! We like the PFC front rotors but I have not tried Girodisc. - Andrew

05-18-2020, 04:40 PM	#10
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Thanks so much guys! If the Gerodisc for '04-'17 fronts fit I might just get 'em. -11.6 lb. unsprung mass off the nose of the car, for only $800! Dayum... Probably stick with 1-piece rears for now...

05-19-2020, 06:32 PM	#11
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	GiroDisc site doesn't show BRZ fitments, but this site shows front and rear Girodisc 2-piece rotors for BRZ "with Brembo brakes": https://www.knsbrakes.com/c/car-item...5_Brake+Rotors

05-19-2020, 06:51 PM	#12
NaturallyAspirated Member Join Date: Sep 2019 Drives: 2019 BRZ w/ PP Location: NorCal Posts: 77 Thanks: 96 Thanked 76 Times in 42 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	KNS Brakes is legit and I'd contact them to get more details. I'm willing to bet the front rotors will be a direct fit, but as mentioned the rear hats will be different.

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05-19-2020, 09:20 PM	#13
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,406 Thanks: 3,419 Thanked 7,241 Times in 2,962 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	KNS Brakes are good peoples. - Andrew

05-19-2020, 09:35 PM	#14
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Aright I'ma give the a call or drop em a line tomorry...